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Many do cross post. First I recommend verifyng the content is yours. You can do that by putting somewhere on you blog back to your steemit account.

If you are posting old content and cheetah makes a comment on your post you can just reply to it that your re-posting some of your old blog posts here. That alerts curators and the person manually checking @cheetah's comments that this isn't a case of plagiarism.

You can be white listed. Here is the criteria for white listing.

Hey, we can whitelist you if you intend to continue cross-posting articles so you don't get the cheetah comment. However we would ask that you do three things, for this post and future posts, to get on and remain on the whitelist:
1 - Be sure to only cross-post new articles (not repost old stuff).
2 - Include a link in the Steemit blog to the original content on your website.
3 - Make sure your website article links to the Steemit article or your username blog.